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io.trino.operator.FlatSet Maven / Gradle / Ivy
/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.trino.operator;
import com.google.common.base.Throwables;
import io.trino.spi.TrinoException;
import io.trino.spi.block.Block;
import io.trino.spi.type.Type;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.VarHandle;
import static io.airlift.slice.SizeOf.instanceSize;
import static io.airlift.slice.SizeOf.sizeOf;
import static io.trino.operator.VariableWidthData.EMPTY_CHUNK;
import static io.trino.operator.VariableWidthData.POINTER_SIZE;
import static io.trino.spi.StandardErrorCode.GENERIC_INSUFFICIENT_RESOURCES;
import static java.lang.Math.multiplyExact;
import static java.nio.ByteOrder.LITTLE_ENDIAN;
import static java.util.Objects.requireNonNull;
final class FlatSet
{
private static final int INSTANCE_SIZE = instanceSize(FlatSet.class);
// See jdk.internal.util.ArraysSupport#SOFT_MAX_ARRAY_LENGTH for an explanation
private static final int MAX_ARRAY_SIZE = Integer.MAX_VALUE - 8;
// Hash table capacity must be a power of two and at least VECTOR_LENGTH
private static final int INITIAL_CAPACITY = 16;
private static final int RECORDS_PER_GROUP_SHIFT = 10;
private static final int RECORDS_PER_GROUP = 1 << RECORDS_PER_GROUP_SHIFT;
private static final int RECORDS_PER_GROUP_MASK = RECORDS_PER_GROUP - 1;
private static final int VECTOR_LENGTH = Long.BYTES;
private static final VarHandle LONG_HANDLE = MethodHandles.byteArrayViewVarHandle(long[].class, LITTLE_ENDIAN);
private final Type type;
private final MethodHandle writeFlat;
private final MethodHandle hashFlat;
private final MethodHandle distinctFlatBlock;
private final MethodHandle hashBlock;
private final int recordSize;
private final int recordValueOffset;
private boolean hasNull;
private int capacity;
private int mask;
private byte[] control;
private byte[][] recordGroups;
private final VariableWidthData variableWidthData;
private int size;
private int maxFill;
public FlatSet(
Type type,
MethodHandle writeFlat,
MethodHandle hashFlat,
MethodHandle distinctFlatBlock,
MethodHandle hashBlock)
{
this.type = requireNonNull(type, "type is null");
this.writeFlat = requireNonNull(writeFlat, "writeFlat is null");
this.hashFlat = requireNonNull(hashFlat, "hashFlat is null");
this.distinctFlatBlock = requireNonNull(distinctFlatBlock, "distinctFlatBlock is null");
this.hashBlock = requireNonNull(hashBlock, "hashBlock is null");
capacity = INITIAL_CAPACITY;
maxFill = calculateMaxFill(capacity);
mask = capacity - 1;
control = new byte[capacity + VECTOR_LENGTH];
boolean variableWidth = type.isFlatVariableWidth();
variableWidthData = variableWidth ? new VariableWidthData() : null;
recordValueOffset = (variableWidth ? POINTER_SIZE : 0);
recordSize = recordValueOffset + type.getFlatFixedSize();
recordGroups = createRecordGroups(capacity, recordSize);
}
private static byte[][] createRecordGroups(int capacity, int recordSize)
{
if (capacity < RECORDS_PER_GROUP) {
return new byte[][]{new byte[multiplyExact(capacity, recordSize)]};
}
byte[][] groups = new byte[(capacity + 1) >> RECORDS_PER_GROUP_SHIFT][];
for (int i = 0; i < groups.length; i++) {
groups[i] = new byte[multiplyExact(RECORDS_PER_GROUP, recordSize)];
}
return groups;
}
public long getEstimatedSize()
{
return INSTANCE_SIZE +
sizeOf(control) +
(sizeOf(recordGroups[0]) * recordGroups.length) +
(variableWidthData == null ? 0 : variableWidthData.getRetainedSizeBytes());
}
public int size()
{
return size + (hasNull ? 1 : 0);
}
public boolean containsNull()
{
return hasNull;
}
public boolean contains(Block block, int position)
{
if (block.isNull(position)) {
return hasNull;
}
return getIndex(block, position, valueHashCode(block, position)) >= 0;
}
public boolean contains(Block block, int position, long hash)
{
if (block.isNull(position)) {
return hasNull;
}
return getIndex(block, position, hash) >= 0;
}
public void add(Block block, int position)
{
if (block.isNull(position)) {
hasNull = true;
return;
}
addNonNull(block, position, valueHashCode(block, position));
}
public void add(Block block, int position, long hash)
{
if (block.isNull(position)) {
hasNull = true;
return;
}
addNonNull(block, position, hash);
}
private void addNonNull(Block block, int position, long hash)
{
int index = getIndex(block, position, hash);
if (index >= 0) {
return;
}
index = -index - 1;
insert(index, block, position, hash);
size++;
if (size >= maxFill) {
rehash();
}
}
private int getIndex(Block block, int position, long hash)
{
byte hashPrefix = (byte) (hash & 0x7F | 0x80);
int bucket = bucket((int) (hash >> 7));
int step = 1;
long repeated = repeat(hashPrefix);
while (true) {
final long controlVector = (long) LONG_HANDLE.get(control, bucket);
int matchIndex = matchInVector(block, position, bucket, repeated, controlVector);
if (matchIndex >= 0) {
return matchIndex;
}
int emptyIndex = findEmptyInVector(controlVector, bucket);
if (emptyIndex >= 0) {
return -emptyIndex - 1;
}
bucket = bucket(bucket + step);
step += VECTOR_LENGTH;
}
}
private int matchInVector(Block block, int position, int vectorStartBucket, long repeated, long controlVector)
{
long controlMatches = match(controlVector, repeated);
while (controlMatches != 0) {
int bucket = bucket(vectorStartBucket + (Long.numberOfTrailingZeros(controlMatches) >>> 3));
if (valueNotDistinctFrom(bucket, block, position)) {
return bucket;
}
controlMatches = controlMatches & (controlMatches - 1);
}
return -1;
}
private int findEmptyInVector(long vector, int vectorStartBucket)
{
long controlMatches = match(vector, 0x00_00_00_00_00_00_00_00L);
if (controlMatches == 0) {
return -1;
}
int slot = Long.numberOfTrailingZeros(controlMatches) >>> 3;
return bucket(vectorStartBucket + slot);
}
private void insert(int index, Block block, int position, long hash)
{
setControl(index, (byte) (hash & 0x7F | 0x80));
byte[] records = getRecords(index);
int recordOffset = getRecordOffset(index);
// write value
byte[] variableWidthChunk = EMPTY_CHUNK;
int variableWidthChunkOffset = 0;
if (variableWidthData != null) {
int variableWidthLength = type.getFlatVariableWidthSize(block, position);
variableWidthChunk = variableWidthData.allocate(records, recordOffset, variableWidthLength);
variableWidthChunkOffset = VariableWidthData.getChunkOffset(records, recordOffset);
}
try {
writeFlat.invokeExact(block, position, records, recordOffset + recordValueOffset, variableWidthChunk, variableWidthChunkOffset);
}
catch (Throwable throwable) {
Throwables.throwIfUnchecked(throwable);
throw new RuntimeException(throwable);
}
}
private void setControl(int index, byte hashPrefix)
{
control[index] = hashPrefix;
if (index < VECTOR_LENGTH) {
control[index + capacity] = hashPrefix;
}
}
private void rehash()
{
int oldCapacity = capacity;
byte[] oldControl = control;
byte[][] oldRecordGroups = recordGroups;
long newCapacityLong = capacity * 2L;
if (newCapacityLong > MAX_ARRAY_SIZE) {
throw new TrinoException(GENERIC_INSUFFICIENT_RESOURCES, "Size of hash table cannot exceed 1 billion entries");
}
capacity = (int) newCapacityLong;
maxFill = calculateMaxFill(capacity);
mask = capacity - 1;
control = new byte[capacity + VECTOR_LENGTH];
recordGroups = createRecordGroups(capacity, recordSize);
for (int oldIndex = 0; oldIndex < oldCapacity; oldIndex++) {
if (oldControl[oldIndex] != 0) {
byte[] oldRecords = oldRecordGroups[oldIndex >> RECORDS_PER_GROUP_SHIFT];
int oldRecordOffset = getRecordOffset(oldIndex);
long hash = valueHashCode(oldRecords, oldIndex);
byte hashPrefix = (byte) (hash & 0x7F | 0x80);
int bucket = bucket((int) (hash >> 7));
int step = 1;
while (true) {
final long controlVector = (long) LONG_HANDLE.get(control, bucket);
// values are already distinct, so just find the first empty slot
int emptyIndex = findEmptyInVector(controlVector, bucket);
if (emptyIndex >= 0) {
setControl(emptyIndex, hashPrefix);
// copy full record including groupId and count
byte[] records = getRecords(emptyIndex);
int recordOffset = getRecordOffset(emptyIndex);
System.arraycopy(oldRecords, oldRecordOffset, records, recordOffset, recordSize);
break;
}
bucket = bucket(bucket + step);
step += VECTOR_LENGTH;
}
}
}
}
private int bucket(int hash)
{
return hash & mask;
}
private byte[] getRecords(int index)
{
return recordGroups[index >> RECORDS_PER_GROUP_SHIFT];
}
private int getRecordOffset(int index)
{
return (index & RECORDS_PER_GROUP_MASK) * recordSize;
}
private long valueHashCode(byte[] records, int index)
{
int recordOffset = getRecordOffset(index);
try {
byte[] variableWidthChunk = EMPTY_CHUNK;
if (variableWidthData != null) {
variableWidthChunk = variableWidthData.getChunk(records, recordOffset);
}
return (long) hashFlat.invokeExact(
records,
recordOffset + recordValueOffset,
variableWidthChunk);
}
catch (Throwable throwable) {
Throwables.throwIfUnchecked(throwable);
throw new RuntimeException(throwable);
}
}
private long valueHashCode(Block right, int rightPosition)
{
try {
return (long) hashBlock.invokeExact(right, rightPosition);
}
catch (Throwable throwable) {
Throwables.throwIfUnchecked(throwable);
throw new RuntimeException(throwable);
}
}
private boolean valueNotDistinctFrom(int leftPosition, Block right, int rightPosition)
{
byte[] leftRecords = getRecords(leftPosition);
int leftRecordOffset = getRecordOffset(leftPosition);
byte[] leftVariableWidthChunk = EMPTY_CHUNK;
if (variableWidthData != null) {
leftVariableWidthChunk = variableWidthData.getChunk(leftRecords, leftRecordOffset);
}
try {
return !(boolean) distinctFlatBlock.invokeExact(
leftRecords,
leftRecordOffset + recordValueOffset,
leftVariableWidthChunk,
right,
rightPosition);
}
catch (Throwable throwable) {
Throwables.throwIfUnchecked(throwable);
throw new RuntimeException(throwable);
}
}
private static long repeat(byte value)
{
return ((value & 0xFF) * 0x01_01_01_01_01_01_01_01L);
}
private static long match(long vector, long repeatedValue)
{
// HD 6-1
long comparison = vector ^ repeatedValue;
return (comparison - 0x01_01_01_01_01_01_01_01L) & ~comparison & 0x80_80_80_80_80_80_80_80L;
}
private static int calculateMaxFill(int capacity)
{
// The hash table uses a load factory of 15/16
return (capacity / 16) * 15;
}
}
